20734145 has 8 divisors (see below), whose sum is σ = 24967656. Its totient is φ = 16529536.

The previous prime is 20734141. The next prime is 20734157. The reversal of 20734145 is 54143702.

It can be written as a sum of positive squares in 4 ways, for example, as 5438224 + 15295921 = 2332^2 + 3911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20734145 - 2² = 20734141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20734141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5612 + ... + 8541.

It is an arithmetic number, because the mean of its divisors is an integer number (3120957).

Almost surely, 2^20734145 is an apocalyptic number.

It is an amenable number.

20734145 is a deficient number, since it is larger than the sum of its proper divisors (4233511).

20734145 is a wasteful number, since it uses less digits than its factorization.

20734145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14451.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20734145 is about 4553.4761446614. The cubic root of 20734145 is about 274.7232256656.

Adding to 20734145 its reverse (54143702), we get a palindrome (74877847).

It can be divided in two parts, 2073 and 4145, that multiplied together give a triangular number (8592585 = T₄₁₄₅).

The spelling of 20734145 in words is "twenty million, seven hundred thirty-four thousand, one hundred forty-five".